Ventilator



A. G. LARSON VENTILA'IOR Filed Mai'ch e, 1924 Patented Dec. 9, 1924.

UNITED STATES ANDERS GUSTAF LARSON, OF CHB-IS'IIANIA, NORWAY.

VENTILATOR.

Application filed March 6,

To all whom it may concern.

Be it known that I, ANDERs GUs'rAF LAR- SON, a subject of the King of Norway, residing at Prinsens Gate 3, Cln'istiania, Norway, have invented certain new and useful Improvements in Ventilators; and I do hereby declare the following to be a full, clear, and exact description. of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to ventilators for kitchens and other rooms, and has for its object to provide a ventilator acting by the pull of a rod or cord without the use of any spring arrangement, such arrangement being liable to be sooner or later put out of working condition by the spring becoming rusty, etc. Another object of my invention is to provide a ventilator that may be easily cleaned, the whole opening of the ventilator being uncovered by swinging the cover plate or door of the ventilator upwards.

In the following the invention will be de scribed with reference to the accompanying drawings, illustrating my preferred executional form, Fig. 1 being a front view of the ventilator in closed position and Fig. 2 a sectional view on line A A of Fig. 1 taken in the direction indicated by the arrows.

The ventilator consists as usual of a frame 1 which is adapted to be secured into the wall. To this frame is hinged a door 2 by means of lugs 3 fastened by rivets or screws and projecting around pivots 1, said pivots being preferably made integral with the door 2. An arm 5 is cast integral with or fastened in any other manner, to the side of the door at the upper and middle part thereof, and to this arm is in turn fastened a pulling link 6 guided in a boring at the lower end of the ventilator frame, and to the eye 8 of said link another pulling link or cord may be fastened, whereby the ventilator is opened or adjusted. Near one edge of the door on its inside a'supporting arm 9 is pivotally connected to lugs 10 attached to the inside of the door. This supporting arm 9 has at its outer end a projection or bolt 11. When the door is swung by a pull on the pulling link, this bolt 11 moves along the 1924. Serial No. 697,406.

upper side of a stop arm 12 pivoted to a bolt 13 fastened on the frame wall. This stop arm 1.2 has in its upper edge a number of stop notches 14-. In the drawing only two of such notches are shown. As will be seen from Figure 2 the stopping projection 11 of the supporting arm 9, when the pull on the pulling link ceases, will enter into the next one of the stop notches 14, whereby the door 2 is held fast in this position. The ventilator consequently is adjustable into so many positions as there are stop notches 14: in the stop arm 12. If it is desired to close the ventilator completely, it will be suiiicient to continue the pull on the pulling link or the pulling cord until the projection 11 of the stop arm falls down through a guiding channel 15 formed by the rear side of the arm 12 and a projection 16 on the ventilator frame. The projection 11 then falls down to the bottom of the ventilator frame, and the door will snap into closed position by its own weight, because it carries the supporting arm 9 past the end of the pivoted stop arm 12 into the position shown in dotted lines in Fig. 2.

In order to obtain a more safe operation of the ventilator, the door may preferably be weighted, as for instance by a massive cross piece 17 or the like at the lowermost part of the door.

If the device is to be cleansed it will be suflicient only to swing up the door 2 cone pletely, as much as it is possible. At the same time the supporting arm 9 must be held in a lifted position, so that it is passed out from the ventilator frame, and then the whole ventilator opening is free for cleaning purposes.

The described constructional form is intended for ventilators arranged high up on the wall. For ventilators arranged nearer the floor, the pulling device 5 and 6 may be dispensed with and replaced by a grip or a handle on the ventilator door.

Claim:

A ventilator comprising a frame; a weighted door pivotally mounted in said frame; a stop arm pivotally secured in said frame and having stop notches in its upper edge; a supporting arm pivotally secured to said door and having a bolt on its free end adapted to cooperate with said notches to hold the door in predetermined open positions; an operating arm secured to said door; In testimony that I claim the foregoing and means for exertlng a pulllng force on as my mventlon, I have slgned my name 111 10 sald opemtlng arm whereby -S21;1d .Sl1 pp O]31'/l1lg pnesenqe of two SHbSCllblIlg wltnesses.

arm will hold said door in any position eor- T m r X Y I 5 responding to the notches in said stop arm AADERS (TUbTAF LARSON- and Will be closed due to its Weight snb se- WVitnesses: quent to ng pull ng force sn fis on MAGNII Ewen,

to pull the door open to its greatest extent. HAGNY SYVERSEN. 

